best single speed bike

Can anyone help. l have a autistic son who can ride a bike but not handle gears. what type of single speed bike would be better for him? He will not be riding much on roads,more wet, cross country. He is 23yrs,5ft 8ins and weighs about 119lbs. He is wiry but strong. Any ideas

Full blown knobblies will wear out pretty quickly on the tarmac, though. I like semi-slicks of some sort a little better, personally. Of course this isn't a major concern until he wears out tires or is just plain displeased with stock tires.

I like these for mostly pavement, under 600 grams, around $20, sometimes down to $15

These for at least half time on dirt, under 600 grams, same price range.

Great idea! I work with challenged kids and adults and most love to get out riding, a few questions:
Are you familiar with bike/will you be comfortable assembling one? Do you know what size he will need?
Mail order might not be the way to go. Are there any bike shops near you? It would be worth going in and talking with them.

"Science has proven that if you have one flat on your bike, you will have another one, sooner or later. This is the reason that you should always buy a new bike when you get a flat." Mr Grumpy
"If you can look at a Pug/Moonlander and not want to immediately go play on it, you must have no joy in your heart." misskaz

yeah, definitely hit up the local shops.
Take your son with you so the shop can get him on the correct size bike.
you might pay slightly more, but quite often they will offer free or discounted services with the purchase of a new bike so it is worth it for new riders.

My Hubbie is familiar with bikes,we live in the UK,most bike shops would prefer to sell us a low gear bike and my husband adjust it. On the internet we could get a single gear bike mostly from abroad..but there are so many its hard to make the right choice,my boy just wants to ride..ride .ride, but thank you for your input,you all have been so helpful with your sugestions.

"Science has proven that if you have one flat on your bike, you will have another one, sooner or later. This is the reason that you should always buy a new bike when you get a flat." Mr Grumpy
"If you can look at a Pug/Moonlander and not want to immediately go play on it, you must have no joy in your heart." misskaz